SG6846BCSY

高度集成绿色模式PWM控制器 Highly Integrated Green-Mode PWM Controller

Description

The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode. This completely shuts off PWM output. 

Features

  Low Startup Current: 8µA

  Low Operating Current: 3.7mA

  Peak-Current Mode Operation with Cycle-by-cycle Current Limiting

  PWM Frequency Continuously Decreasing with Burst Mode at Light Loads

  VDDOver Voltage Protection OVP

  AC Input Brownout Protection with Hysteresis

  Constant Output Power Limit Full AC Input Range

  Internal Latch Circuit for OVP, OTP, and OCP BLSY, BLSZ

  Two-level OCP Delay with 200ms

  Programmable PWM Frequency with Frequency Hopping

  OCP Threshold is 2/3 Peak Current Limit

  Soft Startup Time: 5ms

Applications

General-purpose switch-mode power supplies and flyback power converters, including:

Power Adapters

Open-frame SMPS

SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers